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#Astronomy
thefirststarr · a day ago
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What's happening to this cirrus cloud? Ice crystals are acting like little floating prisms. Known informally as a fire rainbow for its flame-like appearance, a circumhorizon arc appears parallel to the horizon. For a circumhorizontal arc to be visible, the Sun must be at least 58 degrees high in a sky where cirrus clouds present below. The numerous, flat, hexagonal ice-crystals that compose the cirrus cloud must be aligned horizontally to properly refract sunlight in a similar manner. Therefore, circumhorizontal arcs are somewhat unusual to see. The featured fire rainbow was photographed earlier this month near West Virginia, USA.
Image Credit: Christa Harbig
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just--space · 13 hours ago
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NGC 346: Star Forming Cluster in the SMC : Are stars still forming in the Milky Way's satellite galaxies? Found among the Small Magellanic Cloud's (SMC's) clusters and nebulas, NGC 346 is a star forming region about 200 light-years across, pictured here in the center of a Hubble Space Telescope image. A satellite galaxy of the Milky Way, the Small Magellanic Cloud (SMC) is a wonder of the southern sky, a mere 210,000 light-years distant in the constellation of the Toucan (Tucana). Exploring NGC 346, astronomers have identified a population of embryonic stars strung along the dark, intersecting dust lanes visible here on the right. Still collapsing within their natal clouds, the stellar infants' light is reddened by the intervening dust. Toward the top of the frame is another star cluster with intrinsically older and redder stars. A small, irregular galaxy, the SMC itself represents a type of galaxy more common in the early Universe. These small galaxies, though, are thought to be building blocks for the larger galaxies present today. via NASA
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astronomypoetry · a day ago
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Heart and Soul nebulae in the constellation Cassiopeia
The Heart Nebula (IC 1805) located on the right of this image, has a shape reminiscent of a classical heart symbol. To the top of the Heart nebula, lies The Fishhead nebula (IC 1795) is a part of a complex of star forming regions that lie at the edge of a large molecular cloud.
The Soul Nebula (IC 1871) is visible on bottom left of this image. Both nebulas shine brightly in the red light of energized hydrogen.
Several young open clusters of stars are visible near the nebula centers. Melotte 15 (Heart of the Heart nebula) is a popular target.
Light takes about 6,000 years to reach us from these nebulas, which together span roughly 300 light years.
Image 1 – Widefield image of The Heart and Soul nebulae
Image 2 – Cropped image rendering Melotte 15 (Heart of the Heart nebula)
Image 3- Cropped image of The Fishhead nebula
Image 4 – Soul nebula
Image 5 – Annotated version
Photos made by Sendhil
If you enjoyed this wonder, follow my blog @astronomypoetry for more amazing astro.
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sciencefactss · a day ago
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If you enjoyed this facts, follow my blog @sciencefactss for more interesting science facts.
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squids-among-stars · 2 days ago
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Squidolus [Day:1541 Hour:0]
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kiarapeloso · a day ago
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What I love about studying Natural Sciences is that right now I’m just diving deeper into the science of metabolism in my Chemistry class, which is technically diving deeper into the last unit of my Biology class, but just with a Chem twist which makes it like crazy interesting but at the same time crazy confusing and the exam is tomorrow and I am battling my mind because it turns out that NAD+ IS ACTUALLY REDUCING TO NADH AND NOT OXIDISING BUT I USED TO THINK THAT IT WAS AND HOW DID MY BIOLOGY PROFESSOR NOT POINT THAT OUT WHEN I WROTE IT IN THE LITERAL EXAM?! Sorry, I’m panicking and I shouldn’t be doing so in a Tumblr post, but COME ON HOW DID I NOT NOTICE-
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captainpotassium · a day ago
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Harvest Moon Trail via NASA https://ift.tt/3zxbbVF
Famed in festival, story, and song the best known full moon is the Harvest Moon. For northern hemisphere dwellers that's a traditional name of the full moon nearest the September equinox. Seen from Saunderstown, Rhode Island, planet Earth, this Harvest Moon left a broad streak of warm hues as it rose through a twilight sky over the Newport Bridge. On September 20 its trail was captured in a single 22 minute exposure using a dense filter and a digital camera. Only two days later the September equinox marked a change of season and the beginning of autumn in the north. In fact, recognizing a season as the time between solstice and equinox, this Harvest Moon was the fourth full moon of the season, coming just before the astronomical end of northern summer.
(Published September 23, 2021)
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zespaceblog · 7 hours ago
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Cassiopeia
For those in the Northern Hemisphere, the constellation of Cassiopeia is almost as recognisable as the big dipper (Ursa Major), as a W of stars high up in the sky, all year around.
Stars
The main stars that make up this W are :-
Caph (Beta Cass) - F2III type (White-Yellow) - 54.7 LYs
Shedir (Alpha Cass) - K0-III type (Orange) - 228 LYs
Gamma Cass - B0-IV (Blue) - 549 LYs
Ruchbah (Delta Cass) - A5IV - White 99 LYs
All of these 4 stars that make up the W have passed their main sequence, and are in the later ages of their life, denoted by the III or IV after the spectral type.
There are of course many interesting stars in Cassiopeia apart from those who make up the W shape.
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Achird is just 20 light years from Earth, a near G type star, very similar to our own Sun, however it has a K type (smaller orange) companion, so is in a binary system with it.
Deep Space Objects
NGC 281
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Also in Cassiopeia is the Pacman Nebula NGC 281, although you'll require a fairly good telescope to spot it, it sits almost 10,00 light years away and is a body of gas that glows from bombardment of ultra violet light from stars hidden behind the dark nebula part, making up pacman's mouth.
Also IC 1805, the heart nebula sits at 7,500 light years.
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The starburst irregular galaxy IC 10 also sits just off the top of the W
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This galaxy is one of the closest to the Milky Way and part of the loca group of galaxies we belong to.
Of course, there's plenty of other amazing objects to be found in Cassiopeia and this is by no means an exhaustive list, but rather, meant to whet your appetite for what is a well known constellation, but with not so well known hidden gems.
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just--space · a day ago
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Cygnus Without Stars : The sky is filled with faintly glowing gas, though it can take a sensitive camera and telescope to see it. For example, this twelve-degree-wide view of the northern part of the constellation Cygnus reveals a complex array of cosmic clouds of gas along the plane of our Milky Way galaxy. The featured mosaic of telescopic images was recorded through two filters: an H-alpha filter that transmits only visible red light from glowing hydrogen atoms, and a blue filter that transmits primarily light emitted by the slight amount of energized oxygen. Therefore, in this 18-hour exposure image, blue areas are hotter than red. Further digital processing has removed the myriad of point-like Milky Way stars from the scene. Recognizable bright nebulas include NGC 7000 (North America Nebula), and IC 5070 (Pelican Nebula) on the left with IC 1318 (Butterfly Nebula) and NGC 6888 (Crescent Nebula) on the right -- but others can be found throughout the wide field. via NASA
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mystarypi-astronomy · 17 hours ago
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This is the Bubble Nebula! 💭💭💭
This nebula in the constellation of Cassiopeia is blown into a bubble shape by the bright, hot star at its center. The width of the bubble is a whopping 7 light years across, which is 1.5 times the distance from the Sun to our nearest star, Alpha Centauri! 🔥🔥🔥 
Taken by me (Michelle Park) using the Slooh Canary Two telescope on September 21st, 2021 at 2:02 UTC. 
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astronomypoetry · 15 hours ago
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Saturn’s Aurora! This real image was taken by the Hubble Space Telescope, it shows the gas giant Saturn with it’s Aurora. Saturn is the sixth planet from the Sun and the second-largest in the Solar System, after Jupiter. It is a gas giant with an average radius of about nine and a half times that of Earth. It only has one-eighth the average density of Earth; however, with its larger volume, Saturn is over 95 times more massive.
Follow @astronomypoetry if you enjoyed this space wonder.🔭
Visit my brand new clothing store:
https://www.astronomypoetry.com
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sciencefactss · 16 hours ago
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Please follow my brand new Facebook page:
->Here’s the link to the FB page<-
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